Improved spring giiamf for glass-blowers



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.y THOMAS 'wenTMAu orY rrrfrsnne, ArnrnisrtvliivrA.'

Letters Patent No. 102,899, `dated May 10, 1870.

"IMPRovED spuma` CLAMP PoR GLASS-Bauwens.

The Schedule referred to in these Letters APatent andmarkng part of thesame.

I, THOMAS W IGHTMAN, of Pittsburg, inthe county of Alleghenyand State ofPennsylvania, have invented certain Improvementsiu the Glass-Blowers"Spring Clampl for Shaping the Month-Edges and Lips of i GlssVessels, ofwhich the following is a specification.'

Nature ,and Objects of the 'I1wentz'on..-

vessel intended forpreserving fresh fruits, &c.

Description of the Accompanying Drawings.

Figure 1 is a side View of a glassblowel"s spring clamp aswhen closed,and

Figure 2 is a plan view of the core end of lhe same,

embodying my invention General Description.

. The glass-hlowersspring clamp is a well-known implement, consisting oftwo jaws, a on the ends of a bent spring -a a', which forms the handle,incombination with an intervening plate, b, in the center of which -issupported a skeleton core, c,;by an adjustable stem, c', as representedinthe drawings.

In using the said clamp the mouth lend of the glass vessel. isv formedby applying the hot plastc'mouth end of the same, around 'over the corec and against the plate b, then closing the jaws a a upon it gradually,and at the same time rotatngthe vessel so as `Jco produce, by,compression, a mouth and lip which,

will, in general shape or form, bev counterparts of the said jaws,plate, and core.

V.A curved cross-piece, d, is fixed on the stem c', and its two endsslipping accurately' in respective holes in the two arms a aot'thesprngser ve as guides for the moving jaws a a. Y

j My 'invention consists of a circular recess, E, made in the center ofthe plate l), the diameter of which recess is about a quarter of aninch, more or less, greater than'the diameter of the base ofthe skeletoncore c, which is fixed concentrically in the said recess, as representedin tig. 2, and by the dotted lines 1- 2 in fig. 1. v

VIt'will `be readily understood, without further (lescription, that, asthe'hot .plasticglass of the mouth end of the'jar or bottle to .beoperated on is -jpassed over the core c, and pressed firmly against theplate I),- and then rotated while the jaws a a are being com` .pressedupon the' plastic glass, a lletwill be readily aDdJQuickIy formed uponthe inner edge of the flat upper surface around the mouth of, thevessel, which will be a counterpart of that -part of the recess whichsurrounds the base of the core c.

`I claim as my invention- The recess E, in. combination with the plate band 4core c, substantially as and .for the purpose hereinbefore setforth. THOS. WIGH'lMAN.

Witnesses: l j

M. A. LORENZ, .JoHNKIL WIGHTMAN.

